let a= 6;
let b =18;

console.log(a+b);

console.log(global);

function fn(){
    console.log('函数');
}
fn()

// 唯独不能操作dom和bom
// alert('哈哈哈')
// let ab = document.createElement('11');
// console.log(ab);
// console.log(window); //window is not defined